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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19755113f4c8dd4ee0f6944618d0c92073fda33c738e5263eb9c87210bbfddcc' 
  AND token = 'YB1MWVzG6ZPe4/YdPo3MKkShmndt1bMlyASjlo9TFMY=' 
  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"
    }
  }
}