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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19add2b2b5f397aa976f73ba0114ca86f74a4ee8f17df44d61c2a97f30d2dcfa' 
  AND token = 'tlZ35Wza4uU0E285HXu9t0tx1qTSBOpnxn3aQwCD+c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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