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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1662c525c1da54fe61e24c581187149c72b56f2b43315248dd96f766382d2f' 
  AND token = 'EDSVZ9n+FJGMAg0P6X7gxp9i0OW5xLbKaSX9TczeY9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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