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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680eddb815e50ceb9c03b4e61af1d16fc844d0e33a2506b70771c848e19561dd' 
  AND token = '3GYHRIcLd23012kN6Z9UvsLPlM/K7RQBRhrSCydFIAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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