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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a2e2d210722590e6dd08d9a25856550f90de1ebf87b0b825b2a7e7b8c2880c' 
  AND token = 'FdurDS0RMAWPvDzKT97OEzyNNfoI0Zw5HBQbLexCcyk=' 
  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"
    }
  }
}