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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282677a229dd085d4c5890ac59c5c227070765d8d8474757fac5d7686f5b183c' 
  AND token = 'GHiCKfPUvGth3Kbjy2vu+RtXerVdiFI2hcBUqVM1OrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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