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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0ebbd412a09aa2141d73f8c8bb52770b36f08b8b809d94118599b8bf1faccf' 
  AND token = 'qzt+c2eDx7KawY7s/w/YnLE2r0DI4ooEBY5vn1Brqy0=' 
  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"
    }
  }
}