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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd42c5c2f65cc5c0bacc17f2d98a3b48a0e98da455f6498859b202a6a365552' 
  AND token = 'F88M5ZxKsLazPmTkrmIgU+vAxe1sGpPNBE8Gg6253l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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