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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ec000b2aaa3a025ef148e42ec1150bcf753b6a7414bc61535d767a9558ee30' 
  AND token = 'He99/ommZ1DS+16UkMMp6Y2M5w6upm5ek5fTPf9+6Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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