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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5e2b53c59ebed89a2ba5f85bc1d0a3dc0e885cb27a18cf0cc115d9315773c4' 
  AND token = 'iBq3apsUVqkyOglO3+yEBgJt95v6V1wg/Bs2Q2m/Aq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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