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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800856672b7634c4a2ca96c5438f24238ad8d1ff41757ed40fbc4b96beb8c32e' 
  AND token = '5/G5L718a9ctAXn1jG/x4OV++Y9+h+pHZ6OXfWDqn+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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