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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdb2ff276ae29e20dbf1e89c9740365474b12f710ee9b9a4a03d54643e8f526' 
  AND token = 'sE14tFJmF9f7Jw54oNEdhDwBPqlgYiy9/KkSA6FPO4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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