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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708539bb733f8ff426b8fe1ab5027e3cff81ec68e45d04037a8b6a1b133a649c' 
  AND token = 'seoUUDnrtsBoQ4XFkfib/G/CqHpotEXTdXGV2J35AgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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