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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1007ece8cb4c7ea6e5d5cc5eb6420426adec32e15161eb1984a1553fa02f97e6' 
  AND token = 'NMYc98T5CLegkvf8W4/j7SKNmrO56Y+GPe+RJ+3i+Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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