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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6704a4d89d70704f1876f4e45201e44ea44ea6ce24200cdf409440ea5e2c6832' 
  AND token = '0j32bhGz8+q4qw9LQurR1eRMXiYCsnYkAMMsi7iLNXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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