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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ddfc549fce2b5144ec9225e4892501341666abcfb291ee7ce8d55f6f63ef14' 
  AND token = 'S+Kv+YFP05sjcg7908Tbv47a/O1YmrpLeYAoRxKxLrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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