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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eec32f1e4120ec066b71d6685e6f1ef3d6eb0fe0fcb3ba261d2d4683a7b8329' 
  AND token = 'Bj6egop+tr4cN3BLfgKjCHAMVJnDTtpSE6gSpGCfRMo=' 
  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"
    }
  }
}