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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8cd4fa237e8d3e3ecb2f3c60253574419c8a50ec061d4ad4c1255f4106def6' 
  AND token = 'P18Osv4qJokVnN7czI3KpAxldCb+CO3K8kvM0tzjxgs=' 
  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"
    }
  }
}