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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066dc67357eaf48d58dd7bba2e67dd4e973c9860117b30b28c05004a74677bc2' 
  AND token = 'JgIQelVdril83Hv7zboOhc040ZHrd4pR59XLlBVO/bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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