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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dabcfe12040e3d871a3ec60b983a8ac07d131bd72d2fc3b0796f8f4f0940b0' 
  AND token = '8TBTTF4oG1BiPRZA6p62QVY69PKvoJCiYUUZTzjyWls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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