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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98f59e8cb9041cbdd9fea1808fe266d4dd354b6fdf4c9f5c902ee222dc68dbd' 
  AND token = 'Op1+aT+KucFbFpFSUKAJRP2XYv9bv0UAADl3yA6U8v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}