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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efa80c3f36c2a6eaa21e96f6ee21f3e0bc34542b489dbac1adc873daf8ca11b' 
  AND token = '8VxOW2TkXNDnYzfbAZaam2F52a2EvfY8wZoHnMy8+B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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