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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2eb301ec4351640e1972700c621ddd6b5a7f2f84f6942b0d0b0924b0bb2f41' 
  AND token = '8/3gJoZqP2KTf8dSADcxEwES4PWUwIhbrLnYnS+2p1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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