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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151d9519cac1e7ed6e97aebc8c588bcf1f2f5e871144c9c8d1066f45323b572a' 
  AND token = '1LQD2yIWqGkUCiIHj4qSGkRacEkhhnaR+uceDg+MXXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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