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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbb501f590af89e4b83604aef6a7a9b8beff2ffd3fb177d3869c2c9b08035fc' 
  AND token = 'VdGjTMPDyBeXEyqCKwc4t04ovJSrUE0ZRMa73kzWk34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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