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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0431b7c5d42416af0548902cb411ecaef3c38103da1d68c4c668acd7e3712a6' 
  AND token = 'gXL2iGDtXw/zUJYTXaufit1q+ioPJHyy2nT7wJzlID0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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