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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b8d4fbf57c462d95562aac052fe033bec379f76e3c064071dd90a9e44bbd69' 
  AND token = 'mUSpc9vyBBe19BRi6N1Aoeylgl0mKoPivR2a8KUxR/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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