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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dde7004509aca56b2c95a956e4dadbf3c60bae6b63e0e2324f6f60ade9ae7c7' 
  AND token = 'zn6r++5jIlMN5lN0SUpaZwA3pbLDVRHrbu2Hp3J6e3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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