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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e223eba8e969c76f9c0492de4ae94accf61ff5f3d3045b8f67205ff821a6c9b3' 
  AND token = 'ac0Jwuyi2vSlH7OKyp0SUE64NiWz6R3kr9stifv0/ks=' 
  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"
    }
  }
}