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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850ee559eb61944cf2a3f7041071e4d3ec3ffc607b760f294cf58848b637b0fb' 
  AND token = 'Jm8SDy1YTs6Arm5xHe4yuhWO+BMzz82g1H7LFgeeL6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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