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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c881fe34d16489a9d2ba83a38f6ca42b48cb1753ced5e658281f3c102971caf9' 
  AND token = '3c1fLZw6syZ60Mvh93C3pWjIdxnMdTfe+sou7MM9pyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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