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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f836e3037616eebfcbd504d9fdec90e744e8ccf8d8e2274fdea64c371f20959' 
  AND token = 'ma9WG53I6mi/7cEoMqv2xSW34xmNX+VCmx6a+AppHE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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