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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2f9151bacadde577cfa6b60a36f07bacc16ba0eff72b2bb3715e2fcfa7f6c5' 
  AND token = 'Ltk3dHy3yo4AOjwH+9o0ILxJyLHt8CEEZ8IVZvwIhwA=' 
  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"
    }
  }
}