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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17884bd86e66b9130ba71dddefa9712513e2db283415ffe875ab1cd2928ca7dc' 
  AND token = 'lal25H/S2hhC+yc0/NPS66gz/HX9Q98vbu6RR68oCxI=' 
  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"
    }
  }
}