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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba780c1b3fa09c449e72ba7bd12517d3fe94f071f91f5c0a516ac5cc22787abe' 
  AND token = 'mIjHlUAH1d4iIbJlvyAHeC3DHD6cfz4Md5h3PNABx8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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