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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178a002e36c7535b06b8810d5ec703bcd48bda30f460b05cd30d9f0c0450bc1e' 
  AND token = 'BRb1q64f9XrODvpMA+I2ZTyFf03qzvPTaZmDb/InO8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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