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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fb2ec0f53fe6eb42abcb0cd1474221de86e52ce655f1b29ca43a140f892324' 
  AND token = 'CLyIp/0Q/2bmE/hN8+6D5jsAmzka4H0M545lfBrWvLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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