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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913e57984366c74a4e77fb35481213b82523cb491f00ad242e55a9f17f42003f' 
  AND token = 'c2T9VyG4KxH39QU4tvsrLx0kt+VTySMp5C9gGcZ71J8=' 
  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"
    }
  }
}