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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f21b5cb390c13fbeac35eb6674f9544f23facce04ab70a31de30455e5c5f27' 
  AND token = 'pc0OfcEqh4TBB+hc6A4ZFZJJuOsOts5786dLcA7vCM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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