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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff143fe8dc1a00f0ec3d670d2e2eee58850fb237be05bde89ca42658247c36e4' 
  AND token = 'ERppSOdm9KEl3YFnEL/hzBoBMF2II8UcRjyK6RHZpUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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