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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9e961f6b4c099925c0caa4feffbc16c8a6e64ff41a301b57d5a391be48ba2c' 
  AND token = 'CtEdHtoyPJjuGFy4uQLgjQcuOJzn63A8eMnVD/gk+Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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