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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790e9455b79cac072e1868f2d4c2e09d824ed82ef109b75e5673554c84cd7b12' 
  AND token = '7GqTcUGa2athI9Zq7ty0Y32PhcFhiG2+2EV3JgPkbDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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