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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdc2b55a4fb03349ed93dedeb3b5131ea5f1f2fe265de976f0a84b080262c93' 
  AND token = 'jnCYaDLAnJ3ee7oJNY7FcGXbMHjEqL+Jo/beIKgfvGc=' 
  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"
    }
  }
}