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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c1fe5d7df056c908aae1db8523f9a3bdfcf6d141e6a856bd830b129b48c6ad' 
  AND token = '1YhXJbcILZH1dBUAkN6NMU82q3CgDWpMNiDx7+lkeDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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