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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df13c1f54538b0f2de1fe971d5f83d2d9ae6f9059071e2b168eb836e26e4aee8' 
  AND token = 'HqWc3NkOSu7IIExBrRxwc0L4CXUcRs4KV+f/EKwWvQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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