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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7186adfd0c9d48a5ae83561a091cd713553ab58cb0e60bd7a266f3fe74a7558a' 
  AND token = 'O2MWfvQ6QC42l5XDH0OR1sPUoIqvNyloe4gjkD0LUyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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