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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0c4b84bc6d1fd3c8c9dff114830bfbc55a4d61aa132e61b66a42941b112606' 
  AND token = 'jDMTTXtLRtblu5A97nr+T91ipnYdGKXWqQfzPU1DnjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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