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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8347c83ddf15023b2eee814eac8db8ae7f06283a9c2f4c1b092493c64c7392' 
  AND token = 'axbIrlqLChPfWOdbw1yy7uHWL4ZQX3s1sw9iNTxw7k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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