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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1a409138fc20b0a57da493758da39977357ec2380e15e6272493f7aadafc91' 
  AND token = 'zt0ufdEa9DYpuXBph0lTqyFzfhxHylppaqXdyaiWzUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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