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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8132e71e7a77e2ca103793793303b4d8dd1b27eba339c8f7fd17c467365ed9' 
  AND token = 'QNbh3+0OuoSXmxR99ABhPUGjLs71vPJpFI3r5iJqPSA=' 
  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"
    }
  }
}