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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29bb81fcdca4959f3418ce8b4c31f246fd901d74cdd92f034b4eaa0509f9f56' 
  AND token = 'IUoUQSN4mJxA1UaWMquxHtn0UubUuqdU3f0tNU7I7wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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