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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f70d9b00abc8bc86d96e59f9f7f5419299c20db724200545e7ae8fa4ca5d7ac' 
  AND token = '6MA4QhFh4Hl/K5Y5Skn59D7dqe4AVTlhStSPnRE/m+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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