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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40fe312988fd53a0a01feb01d2090a5ad54fe44ac67804816e7f8af09f532f6' 
  AND token = 'jPWtSOkSxoyTNKow+ePp11vq6KGelwiTTWXj0HbHB6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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