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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8a3f0ec471b0d6e6f5de6240e9327463fe714c56e5f9489164f5012e2909be' 
  AND token = 'yPOGhoIs64K4/kiBar8L3AIvAXxogxva6WmlqL8VssI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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