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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6835ce1dc5f478875b80139492febcccd7262851028835a71db62399dec553a' 
  AND token = 'Th6OSJhra03m4+ED949TNPv2Jan1La5H68RgkJQODRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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