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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0218112caec63c0a40f5459079ed5d2f3d6245308119db92aaeac2ffa4459473' 
  AND token = '2FTinQwQ/8zW5PxuEuaf85F5e2COLcXNtVQRIgTUa/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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