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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e8f456e46f5568e5f584e525031cef47193b7c83ffdc17e712793ba39de920' 
  AND token = 'cEVsfniKV1rHWM5jZaq3/hl4kA24h12ZaTM2pXb0JM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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