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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73339137cb0617162bcb62b8257827230fb9fb89544516ff35b927a3e0e1d0b' 
  AND token = '/4TB5oGjlzknfursc4yEGyIPEu7W6cWyeroTQf4dvOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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