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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b7b177b56001c2905032355a1a238b64f4716fc3bfb0535b4555da0fc866c3' 
  AND token = 'N/JlddWEcz8A6PVanyNAAi5cdGPrInsQ/b+hp8THdDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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