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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b877010014a865579aa2e2ae9bb45c1c4a80a4492f87f2c15a37a04aded22254' 
  AND token = 'V7Fmw6EESU/B4yO+LWq8ueGhHQ67SBLfhtSIjABTa24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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