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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b9cfd5a79034f6c4b606bd2a6a6b8a1cd207cc5db596ce53e293b283a4eb30' 
  AND token = 'YF1qwIQsak8RHgTC4Opt0Novhf3MyN7hwE+KqCZ5R1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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