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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1e6c4dee78065244bea487bf87348bb8e5749e13b8e1f92b890b00b7b1dfb9' 
  AND token = 'fg39FfN8Bq09wselv4xO5EfK3ErIDTEUyeg+OY8sEto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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