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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06560d02dbca89fc61523b14769a161d63b3cf0317c2c9705658fd1f485d62da' 
  AND token = 's46BEfw4ug5oHLD3l6h1xCX3kWMDPqig+NNxh5bljDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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