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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a574129da683f2eddf16335ca3f9b4f9844d6fe02af003cee8992d88932196' 
  AND token = 'Vc7l5Ut3Lco/x9dBBUMJ2FaegOYAe1gfC1GqzGSf+hI=' 
  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"
    }
  }
}