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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cf316ac27088acb2d18f567aa16627fd2d89f5f31385f5b1eb8c67dd26df86' 
  AND token = 'xvwQAQ0O6JPzhbP0I110L8yAQnTvk6SXpt+crKsmZVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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