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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6c9d5ae2028b949ab2b30daf42961b7a6e3923e18c26b21ea060bfd0ae9966' 
  AND token = 'cmeajONtvkwTmD784eDNkYZ9ezDRGAit51jPO0CcwPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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